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Python: Remove unwanted characters from a given string

Python String: Exercise-89 with Solution

Write a Python program to remove unwanted characters from a given string.

Sample Solution:-

Python Code:

def remove_chars(str1, unwanted_chars):
    for i in unwanted_chars:
        str1 = str1.replace(i, '')
    return str1



str1 = "Pyth*^on Exercis^es"
str2 = "A%^!B#*CD"

unwanted_chars = ["#", "*", "!", "^", "%"]
print ("Original String : " + str1)
print("After removing unwanted characters:")
print(remove_chars(str1, unwanted_chars))
print ("\nOriginal String : " + str2)
print("After removing unwanted characters:")
print(remove_chars(str2, unwanted_chars))

Sample Output:

Original String : Pyth*^on Exercis^es
After removing unwanted characters:
Python Exercises

Original String : A%^!B#*CD
After removing unwanted characters:
ABCD

Flowchart:

Flowchart: Check whether a given string has a capital letter, a lower case letter, a number and specified length.

Visualize Python code execution:

The following tool visualize what the computer is doing step-by-step as it executes the said program:


Python Code Editor:

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Previous: Write a Python program to check whether a given string contains a capital letter, a lower case letter, a number and a minimum length.
Next: Write a Python program to remove duplicate words from a given string.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

  • The os and os.path modules.
  • The __file__ constant
  • os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
  • os.path.dirname(path) (returns "the directory name of pathname path")
  • os.getcwd() (returns "a string representing the current working directory")
  • os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m